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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2fb67a7d4ff02587a30781e608059643bfaf6bd45c293c367e6d9d3ba8d4ce' 
  AND token = 'giG3XqXRjkK3ncKC7l2scceQyj2RB3fZh99XLAml0TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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