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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc07e363f0cd08eb8a6e3350476fe0acfa326b07ebb6310dd8e2535cafa0448' 
  AND token = 'OdlZQz76caFDc6VSJXRg7fNRuCZN03Sb0eoJOU4jRLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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