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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb07777644a729ab7a5962b5f28215d404a42d54f9a107bd4f8c531c4d52d18' 
  AND token = 'G+njuoY1L129qbMf5vblK26N48HoX5rrjP+kZWCSaxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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