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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f627a5260ea5244bf751fd2bddeecbc85a568c9ed9e7f8496509e3041ec85f81' 
  AND token = 'x0QTw8O4YM9JONd9Og/xQjiPmqB/9iiOQ/cKWQvoMb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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