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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50976ff8b0d4aed749f80930691d9111b6e2e4277997e157a1be98fd6e661ac8' 
  AND token = 'A6XTwgQCiOuVqfz7hfCk/Yat4sHG464S1jmTc0u2PlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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