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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01b9c502d785cada00fc764af492218e81fca4dc49bb74d14c4b06359a556f4' 
  AND token = '9vTotaszh/e7BAHCxiVDBem6mgQDlLSaUGI5dhBgtt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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