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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83771f5f91edea16fe4f6368db0d9f0c71939ff029a87e6ce4d853d97c7839d' 
  AND token = 'kAganX+0cjXLuLBxInzqA6d8AvHdh4zbKODhH7xu9SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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