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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d86edd3af351d48e173ea8e41cb6f38707ec1a223345267a9247d9c5041023' 
  AND token = 'aP0kncKJpieynKvNkPaZJIj4SmCdnXj3z5xTW+ZBs9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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