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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016a0c34372db3b5fc875f55d698ed6cfe9d3c3ddbebafd5ce9eee935bb8f472' 
  AND token = '+RboNWFkiV1zO8y0ieghhjJVY26XHNTv6fMjv1aT1k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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