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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f2b8119d2ccbf25e2460d14971fe2dbe25688dc7fbff71945328e3f077f602' 
  AND token = 'kZQNgyCN7fEFWYutnB9bD63rbTdCd7kWOrN0d1X2Keg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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