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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94d240ef02839e15eb5ee9787cd79a76e2b8b2976621c42c282f4aa77db2431' 
  AND token = 'o8WCCpb5DXWCOnQMXcfpqWivdm0QrI6m9/mtaioI08g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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