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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7cfac80336e5f064c410fff7feb3bf8343c890cabc7277165e249e865aa3e9' 
  AND token = 'e4kMzgoWhGzN5fA3o78+A4yJHj0ZCa174s9cWBjmxgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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