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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aceefe463fba6ddef13b5609a09b03f66424a88a3a1b28ba9e4d337e73bb9481' 
  AND token = 'tSlgdX6UPi3wq1dRJmjCAtaJU1LC3r3IKzqQh/Zcp0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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