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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795260e9f6baa4b141b49e246cc03d8e9746f85e6430ff4bad1d675fb53cec82' 
  AND token = 'aXQZK4EoGSEQtyMrzh9l3oXZbjLi2UqJthKX8u1X4NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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