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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3f7f536c42918025d25731ca545a907a45d206bb034e404b99294c78eb1d58' 
  AND token = '7E/QekCY0XJlq4zc0CnrNNsmTddVnx/A6dnvarzm35s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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