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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d91534fa222a5f2704bc17ecd90f899145bcb0fb7d786888484ab435e1264af' 
  AND token = 'p+WTUfFnPff1I5OT9m6Vmi56NtdQ7ycAe8CIVq2obu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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