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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4813a2add1cf34d53f8dd30d2a4904db1dbb159977d362fb763b1fff1dec278e' 
  AND token = 'x5nZLSsUDDfOIe9VDdkYjKYDd6LAUBc5LY11tFKO/RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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