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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3581be9e190478ced016ba5866e1abc477c9aea86ba810b306f88b366d8e13bc' 
  AND token = 'L9DtAgd8Ct2bmY8oE9PYc4wIR1pil3y46Oy1yOqYxmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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