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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc81f9f10559fcf2e5f40ec7b9b0bf758f4017f9f0c9966eccd92896613b516d' 
  AND token = 'sg+cdkaYM1CF8+r4imS91Mi0eqm3ye+fdwlA4NIm/KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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