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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25060fe9dd2dfbe428e03b4e3920321063846ae92f8ff3b879c41401b40f2087' 
  AND token = 'gN+bGZiEW2fs85m+Hl2br0WQcr4T2qml4zRxx7GxkwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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