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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14dc42d777636fe5083cdec863713dcb9d64ef88c5f78f46a70d82c9e36d603' 
  AND token = '3JSQWCWHMTvO3zSZMA0XI+hKaf3gYqwhgjAAGS8dwkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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