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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbffee35a58848f89e5f28c4b0f7b5ab197e9c1c6942cd981281c6f9253be09' 
  AND token = 'LTJoVqjt00BB6j+nxxNYVwXb9OGeO8Upt4PU2yjksRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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