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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7abd3eba2eac93b7cdde917e7b9240f853b6c1d9e38c4453ca218fbac7516e4' 
  AND token = 'xFUKoHxXgZkce2nq7uDV8W9ILrF+g3m+u1Q4jfp0UFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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