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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27b5c1f1c0a7df225fcc0db379937b6bcfd2e166f78881087256407b6ce134c' 
  AND token = 'Xhqqfh8SRBFgPijrbVppH0npVfT4eyBKumo0D0YFQi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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