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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03d649f06ed246f76644b19d27b743594dc8a620c244a640b211d8badbcecb1' 
  AND token = 'oG/ejnV02zaIZ92yO+iev4anFBzeBmjUoCedtCa5ajI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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