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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9edca1cde814849eaf73e1b3b651759a26b22b22a7e2f054937120e5a3e91a7' 
  AND token = '2H2fLA4KfMAJL8zJmvdc8y2SMAFzx4sdACi2JHdJ7Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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