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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebb35f888317ec5cd52e91870cae5e7dde21ac8e22d8d6170863a85186c75c2' 
  AND token = 'GQ7omLj3/sFYA9Sj65bZBlQVJuRCGppq86iF9kkwfnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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