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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4853664fa2dc0f16e100e59b735230f893e9028fec6676f04c4e37a745c57b89' 
  AND token = '3PDYu5kusWnZhcmF8+SuYb9ryrlPpXTxwyIRGFvZk6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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