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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5cc23c771aeaf71b206269aa1bdea8a826459ee36bf792bf4b7bcbfab02480' 
  AND token = '4kRpatvY+tK8DM92POdBo335emAkAD9CrC88TZ9WfS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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