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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6887e4663b18802aec66a4872187bf7d7ada5018672056aa68d9656773503a5' 
  AND token = 'c9XwNVtabNJDF9yP5rbRdfBHB4rc1KZVLKJEWr3v9MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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