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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd298979b6a5a5c51dde3e959de12f2dda04ba628f44caef4e8444003ec16f7' 
  AND token = '+yv7efFU6jcLTzITBlsM6qv2Bv9k6eXVs/qb9uGndwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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