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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce46c2eac5a829fd866ce1d2218040b9cd70177faa0b2a5c0023257dfdb0e8a' 
  AND token = 'x6FQIrZtch9lqOH5wPhGqdjAbEPQ3OXgg9uO1+VkLbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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