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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bb652f5f0b0743cca11dff3248658faed47ed84dba5faea69c2506899567f6' 
  AND token = 'Z06zgiMoPWD+SG7EQU671x69cBRznCuVnNyN7NFcTvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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