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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03b4e9ee8c0d95317147b9b1964b4f02246ebabf98bce79731393445bc0aa60' 
  AND token = '5iahjbGEOwHSdzw2PBBfn+3NeRK8HtOpadEN2i4NCVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}