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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbbb71ada83993331028f1c9bf66609ff55f571d0196854c9a8678ea163231b' 
  AND token = 'd6OyjU6D0CUjcRLRlxk6Jzy4n5hImUSl0EtatFgxUqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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