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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a119cf6317ac4f3263f3dfd314fb81e5ba5a97b99e6df81890d10b5f3dfae2ab' 
  AND token = 'eXNRkUaKfyLYMdccP+a1qr5GOWh0fjNNJP4kS4x8maY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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