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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d62b76b0dcb8ec07d8dbf36606ed451ddaacbb75f1f95e44952c6381ed9a30e' 
  AND token = 'wTP/oGXoIDLpAkmbXPzSIPr8umUmwbrHF10S+ndFla8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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