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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fba4ba87768cae15149c26ce59c8cadbde27a09ea536cca93a93ad19c125b4' 
  AND token = 'mKifEyHCICrlyR9JdKuem4por/DFws1Bd0ZOzHWIhiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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