SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8561c22c0416c66b177c835d0605578d0cafd5c875333157c47b63bf9e9752fd' 
  AND token = '8Sg/sdsVhrJ61z/+ZOMPS5oCe95SUjk6jUr+BQKlMSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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