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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4447bf38e18a52c985843dc8342dcf1fd5617afdf42a18d41c5688e8f52401e8' 
  AND token = 'Tt7K6YQvez66B0piYEV99zTgHlXbwOH4RWQe/i234cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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