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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e11f8733c9bfc688caf80a11f42aefae4a2509b30760cf7869745d0d29bb0ef' 
  AND token = '2e3a+H2LTqrKmE8alDTz308PM3mOvr/ybKdw2lhxP1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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