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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f7ad565f93577a8b07eb8710c6ad82eebcb26ac60a9a8d2f5ebc81939788aa' 
  AND token = 'lC7likFoDRBtevf9Bt5rkx2zODIO+Qrrrr/LI9yF/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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