SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2649afa65af5e9b4e2386d48d5b747dc9b95210385f2782dbbb178bfeb533d' 
  AND token = '9R+P13JnhLIin6TOeDr2FniKBEKv6oQgeFF4z+GfWTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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