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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9014dd8fa6fdec96d513f29e5ea7b0618907dcf68e2cc436fd6bb5b3da79582f' 
  AND token = 'ChaQB0gZ65IdluluAom/eYuMF/betcJSCOi0ooBQfAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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