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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1147d25f96938e183f69009f1b45331ecc5a80931cb124985bd294e2143dac7' 
  AND token = 'ZZ0q4gHIp/0ZWDT1J9aHA1lpcfHEwNIjNGI2B2PUUV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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