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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377ad3999e7c61b0d0b4533e6c3086e152592199fccb0d7442f24a799cf49d1d' 
  AND token = 'iuaybUHAXYQpHfdr0pM+FMxLHMaJMmoLiqhR9PuuM9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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