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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143ea93c2adfcd713443edeb445877b2f6e5b1d746ff10e5f607a4e3188a9ad5' 
  AND token = 'omC1Vl4EyBgvUCIxnRjREpTBki8oGg3Y0xG1VZzC8jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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