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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54487884faa4091eb726b7dabdbc559b84f76a95aca655c86d0b9eeee7763c5' 
  AND token = 'Kj+QEgQvdh3WpZl1mRpUv51OOkeE/3Ene7odYSp767Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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