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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed48e94c27d5b2d29d68d66c89448eb614d57cc7190876a4768f3f56f772007' 
  AND token = 'd8jwpXn5Et9qhNHo3yItq+jDeqgrqA8ZfatpBQLYixM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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