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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732938548066b64ff4b68a423cc7170d927812a224ccef6fe3224c1a13f6ddad' 
  AND token = '3Iz39lYVU9g2Vb3lVE7f3+NlMpCSTfidlZkIGpiVkVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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