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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ab69127b8da1c3dcf80a1fa49bf9edd0fb70861398c56d6fab5b333cc06055' 
  AND token = '+6wfU+S/zEPEWAzbAbOZiCp/71G6yketgH7B6akmVEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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