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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8571499efe07f7299aed5d77045d867203e756b1030ec0626d71b352c6073b' 
  AND token = 'aWj2f0okDgEzMeLt3NNgF0Ow0TMouLxJVQ2UDmG3qwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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