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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482dd0a9c4bec4804118780500df502a5cd4c5e41efeac8d23a1a177a05c3ec8' 
  AND token = 'JVloI5dl69zcYTe7qX3KooR5Iyv297RDqkYbZPclGPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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