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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8110bf3c3ec0da2a3260641294b2a09f6a469b33a67bc99594ca622d9f57ff' 
  AND token = 'N/R9bHrSwSM8IJZPefJ4vfphPsLC8IkjAlovYEjF738=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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