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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05687bcb74013aa7bf41db415728e32fd762336d1cc36b1e82e64fb1a10d93c' 
  AND token = 'D2RFnH+0nk99ApiWp5G8pb14CiUW86GsTyNOBsG424U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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