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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fbf8a6c67c90920cfff9eaf778693a1633b593804ba1caf375d7231e4facd7' 
  AND token = 'WJnY9/cVT1aT9Lsw4IgENhklG0RFKSB84WZkBMkGcx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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