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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047e27c29e079bbdf202f5932c8979bc819887ac5423d7951ddf27b84d6d06f8' 
  AND token = 'yNPC0Jc4UyM8KcoEPxzMcOyurV82PRmYTIlEsVq19TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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