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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a532f930993898a35b762b74c4d3cba1c8ebef4609e131dad59c7945bda5a80' 
  AND token = '3f2xBbHYXkx9MH8yPeZiREGd64/RfIqOupHAEpDUfLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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