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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3056e5221eafd986fa9022f8ed43a9efce54be4afe8f82f6f91010808d432e9d' 
  AND token = 'uX70DNgenwpF794+Ii1mvS8D6KtU3nBIilbjqrZ4OJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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