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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b7e06d28dcdff2d4148211726a41111dda33987adaa4fa230616f94491459d' 
  AND token = 'k7eF5EO8DyVI9jjiM5M2LwUcXIQ6u/rMnKFL93akDvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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