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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2f9de285dcd0b403fee198561783e2e61e26a19cb0d8967965583f2e63a65b' 
  AND token = '656RwZSgLMj6oYaYCRFjhqAIu7vFcN5DBYLl3yTzRbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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