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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18449935f09b60a80569e31331b20b76b1f6aa4858b75dba245f4b61fb0c27d3' 
  AND token = 'bqy6IrfcsS4+RAgucbLeB6IW2IUmSm9hK4L3S3wt+Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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